Hi there, Greg! Thanks for getting in touch and welcome to the forums. 🙂
You’re likely getting that notice because the version of The Events Calendar plugin is newer than the version of The Events Calendar PRO. We recommend running the same version numbers for both plugins so they work well together.
We’re currently at version 3.8.1 for both plugins. Are the updates available when you log into WordPress and head over to Plugins > Installed Plugins? If so, go through the process of updating the The Events Calendar and The Events Calendar PRO so they are both the same version.
Does that make sense? Will that work for you? Please let me know. 🙂
Cheers!
Geoff